Fat Spike is supposed to be the same as Grosso, the well known commercial lavandin variety from France. But our Fat Spike plants are noticeably different from our Grosso. Fat Spike has wider leaves and an overall tougher, more vigorous growth habit than Grosso. Our stock for these two originally came from different but well-respected lavender growers on the west coast of America. It looks like over the years the original Grosso variety has morphed into a range of forms and our plants may be evidence of that.